1998 GMC W7500 Forward Service and Repair Manual
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1998 GMC W7500 Forward Service and Repair Manual
Heaviest of GMC's W-series cab-overs, the 1998 W7500 Forward is an Isuzu FVR under GMC badging, built as the W7R042 straight truck with a low tilt cab. It runs the turbocharged 7.1L inline-six diesel of 435 cubic inches in what was the last year before the 7.8L engine took over. This factory service and repair manual is tied to the 1998 build, with procedures, specifications, torque values, wiring diagrams, diagnostics and maintenance schedules for the engine, injection system, brakes, driveline, chassis and cab.
Engines covered
- 7.1L inline-six (435 cu in) — turbocharged, diesel
Body styles covered
- straight truck, low tilt
Trims covered
- W7R042
Known issues on the 1998 W7500 Forward. No recalls are on federal record, and NHTSA holds no owner complaints for this year. This manual's maintenance schedules and diagnostic procedures support keeping the engine, brakes and electrical system in specification.